Tractor



FIG. 1 is a front elevation view of a tractor, showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is an upper left front perspective view thereof; and,

FIG. 7 is an upper right rear perspective view thereof.

A bottom view is omitted because it is plain and unornamental and forms no part of the subject matter of the claimed design.

The portions of the tractor shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a tractor, as shown and described. 